#bag{
    width: 200px;
    height: 500px;
    margin: 0  auto;
    background: url("img/bag.png") center no-repeat;
    background-size: 80%;
}

#bag.burst
{
    background-image: url("img/bag-burst.png");
}

#bag-health{
    width: 200px;
    border: 2px #000 solid;
    margin: 0  auto 20px auto;
}

#bag-health div{
    height: 20px;
    background: crimson;
}

#controls{
    width: 200px;
    margin: 0 auto;
}

#controls button{
    margin-left: 20px;
}